For enhanced safety, the front and rear seat shoulder belts of the Rolls-Royce Ghost have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Genesis G90 doesn’t offer pretensioners for its rear seat belts.
Both the Ghost and G90 have child safety locks to prevent children from opening the rear doors. The Ghost has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The G90’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
The Ghost has standard PostCrash, which automatically apply the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The G90 doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the Ghost. But it costs extra on the G90.
Both the Ghost and the G90 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, around view monitors, rear cross-path warning and driver alert monitors.
The Rolls-Royce Ghost weighs 540 to 926 pounds more than the Genesis G90. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.